This prototype, along with every available build after the 0524 prototype, is a dump of the Sonic & KnucklesUPMEM chip. In order for this build to be playable, it must be attached to the beginning of a Sonic 2 ROM. Merging these two ROMs emulates the use of Lock-On Technology. The Knuckles in Sonic 2 0524 prototype is the only prototype released as a working stand-alone build.

Download Knuckles the Echidna in Sonic the Hedgehog 2 (prototype 0608)Multiple downloads available